Apparatus for casting bearings



Sept. 3, 1929. E. P. KERRUISH 4 1,726,902

APPARATUS FOR CASTING BEARINGS Filed Dec. 2'7. 192s Edward P. Kerruish 4-1 TTORAI Patented Sept. 3, 1929.

UNITED STATES PATENT OFFICE.

EDW'ARD P. KERRUISH, OF CLEVELAND HEIGHTS, OHIO, ASSIGNOR TO THE GLEVELAN D GRAPHITE BRONZE COMPANY, OF OLEVELAND,'OHIO, A CORPORATION OF OHIO.

APPARATUS FOR CASTING BEARINGS.

Application filed December 27, 1926. Serial No. 157,051.

The present invention relates to a cast bearing, and a method of" producing the same, which shall be provided with a series of spaced recesses or indentations for the retention either of solid or of liquid lubricant.

In the manufacture of hearings to be subsequently provided with self-lubricating ma terial held in pockets or recesses it is usual to cast the bearing with a solid surface and then machine out the desired recesses. The objection to this method is that only certain shapes of recesses can be produced by machining and in many cases the surface of the bearing is largely cut away and provides 5 an inadequate metal surface because of the various grooves which have been machined therein. The chief purpose of the present invention is to provide a method of forming entirely separated recesses of substantially any desired shape without any machining operations, the formation of the recesses being completed during the casting of the bearing. To the accomplishment of the foregoing and related ends, said invention,

then, consists of the means hereinafter fully described and particularly pointed out in the claims.

The annexed drawing and the following description set forth in detail certain means and one mode of carrying out the invention, such disclosed means and mode illustrating, however, but one of various ways in which the principle of the invention may be used.

In said annexed drawing:

Fig. 1 is a longitudinal central section through a mold apparatus adapted to carry out the present process; and Fig. 2 is a transverse section on the line 22 of Fig. 1.

In Fig. 1 there is shown a two-piece mold consisting of a hollow cylindrical shell 1 and an inner core 2. The outer shell is provided with an enlarged central chamber 3 in which the bearing is to be formed, and which is connected to the outside by a pouring sprue l. The inner core is cylindrical and fits snugly with the greater portion of the central opening through the mold 1 and forms the other wall of the inner chamber 3 in this mold. This core is provided with a series of spring-pressed plungers 5 which are normally held in the position shown in Figs. 1 and 2 by means of a series of coiled springs 6, which allow the plungers to be pressed inwardly into core 2 when it is desired to remove the core from the mold.

In the manufacture of the bearing the inner core is first assembled in the outer mold, which of course shall be made in two halves, after which molten metal is poured through the sprue 4 and allowed to surround the inner core and fill the mold chamber 3. I/Vhen the metal is cold the inner core is withdrawn longitudinally from the mold, the shape of the plungers 5 causing them to ride out of the indentations which they have produced in the inner wall of the bearing, after which the outer mold is open and the bearing removed and is then finished both inside and outside in any suitable manner.

It will be evident that other shapes of plungers may be used if desired, provided the projecting portion is so shaped as to cause it to ride out of the cast metal, although if other shapes are required mechanism can be provided within the core for retracting these plungers prior to the removal of the core from the casting.

Other modes of applying the principle of my invention may be employed instead of the one explained, change being made as regards the means and the steps herein disclosed, provided those stated by any of the following claims or their equivalent be employed.

I therefore particularly point out and dis tinctly claim as my invention 1. In apparatus of the character described, the combination of a hollow cylindrical mold having an enlarged central mold chamber, a second mold element removably disposed within said first-named mold to serve as the inner wall of such central chamber, and a series of spring pressed plungers disposed radially in said second mold element and extending into said central chamber.

2. In apparatus of the character described,

the combination of a hollow cylindrical mold having an enlarged central mold chamber, a second mold element removably disposed within said first named mold to serve as the inner wall of such central chamber, and a series of retractable elements carried by said second mold element and projecting into said central chamber.

3. In apparatus of the character described,

the combination 0]": a hollow cylindrical mold tractable elements extending beyond the surhaving an enlarged central mold chamber, face of said second mold element into said a second mold element removably disposed central chamber. 10 'Within said first named mold to serve as the Signed by me, this 17th day of December, 5 inner Wall of such central chamber, and a 1926.

series of retractable elements readily dis- 7 posed in said second mold element, said re- EDWARD P. KERRUISH. 

